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My first elementary school had that same Simplex master clock installed in the 1990s to replace their original 1974 Simplex master clock. But then it shorted out in 2011 and got replaced with an American Time & Signal AllSync master clock.
My first elementary school had that same Simplex master clock installed in the 1990s to replace their original 1974 Simplex master clock. But then it shorted out in 2011 and got replaced with an American Time & Signal AllSync master clock.